Quick-opening vise



A. e. HAGSTROM.-

QUICK OPENING VISE.

APPLICATION FILED MAR. 6.1919,

I .Zrvvnfafi 1 M4. 4

A f far/75g Patnted Nov. 11, 1919.

UNITED STATES PATENT oEEIoE.

ALBERT e. HAGs RoM, or EAsT'HARTEoRD, CONNECTICUT, AssIGNoR To THESPAFFORD TOOL woRKs, STANLEY E. SIPAFFORD, PROPRIETOR, E nARTEoRn,

CONNECTICUT.

' QUICK-OPENING VISE.

' Application filed; March 6, 1919. seriain'o. 280,996. I

To all whom it may concern: v

Be it known that I, ALBERT G. HAGSTROM,

. a citizen of the United States, residing at East Hartford, in thecounty of Hartford and State of Connecticut, have invented a new anduseful Improvement in Quick- Opening Vises,of which the following is aspecification.

' This invention relates to those vises pro vided for attachment to abench or to a milling, drilling or like machine, which are particularlyserviceable where a large number of pieces of metal of substantially thesame size are to be operated upon and it is desirable to close the jawsquickly and powerfully on the pieces. Such vises come inonly have a jawwhich is moved quickly up to the piece to be held by a cam andpowerfully bound against the piece by an eccentric, the cam andeccentric being adjustably mounted on a slide carrying the movable jawso that the position of the cam and cocentric may be altered fordifferent sizes and shapes of pieces. In vises of this character theresistance of the pressure exerted by the cam and eccentric when a pieceis bound between the jaws, is borne by the adjustable connection betweenthe cam and eccentric mounting and the slide carrying the mov able jaw,and this connection unless great care is exercised and it is made verytight frequently loosens when the cam and eccentric are turned forclosing the'jaws and also under the vibration of the action of the toolsupon the piece held by the'jaws, and allows the movable jaw to slip andrelease the piece, to the annoyance of the workman and often withdisastrous results to the piece being operated upon.

The object of this improvement is to provide a very simple means wherebythe adjustable connection between the mounting for the cam and eccentricand the slide carrying the movable jaw if tightened w1th ordinary carecannot possibly slip when the piece is being clamped or when the pieceis being operated upon.

Figure 1 of the accompanying drawings shows a plan of a vise providedwith this improvement. Fig. 2 shows a 'lOIlgltlldlIltl section of thesame taken on the plane indlcated by the dotted line 22 on Fig. 1. Fig.3 shows an end view of the wee.

The base 1 is provided wlth bolt holes 2 whereby it may be fastened to ashop bench or to the work-carrying part of a machine tool. In the top ofthe base and extending longitudinally is a groove 3 and fixed on the topof the base and extending across this groove is the fixed jaw 4E whichis desirably provided on its back face with a piece of hardened metal5..

Movable back and forth in the groove in the top of the base is a slide 6which at its front end on top carries the movable jaw 7. In the top ofthe slide is a slot 8 having an inverted T-shape in cross section. Thisslot extends longitudinally of the slide and obliquely with "relation tothe upper and lower surfaces of the slide, inclining upwardly toward themovable jaw so that the vertical walls of the leg or the narrowestportion of the T-shaped slot increase in thickness away from the movablejaw. Ly- 'ing in this inclined T-shaped slot in the slide is theT-shaped'head 9 of a stud 10 which extends upwardly out of the slotabove the slide. On this stud is a bushing 11 and above the bushing andturning on the thread ed end of the stud is a nut 12. When this nut isscrewed down the wallsof the slot in the slide are gripped between thehead of the stud and the, bushing on the stud.

Turning on the bushing is an eccentric sleeve 13 provided with a handle14, and turning on this eccentric sleeve is a cam 15 provided with ahandle 16. In order to draw the movable jaw toward the fixed jaw forclamping a piece of metal between the jaws, the handle 16 is turnedaround to a position substantially longitudinal with relation to theslide, the cam bearing against the hardened plate on the back of thefixed jaw during this movement in such manner as to draw back th slideand movable jaw with a quick movement. After the movable jaw has beendrawn back by the cam, the handle 14 is turned and this rotates theeccentric sleeve inside of the cam and exercises a still greater forceso that the movable jaw is closed more powerfully and bound in position.In order to open the jaws, the eccentric handle is first turned to oneside and then the cam handle is turned in the same direction.

As the T-shaped slot in the top of the slide is inclined toward themovable jaw so that the walls of the slot thicken away from the movablejaw, when the cam and eccentrio are turned for exerting closingpressure,

in; thickness i-the'ygfcrniz a Wedge; between theupperjsurfac'e;o-fithetheed offthe stud ;.and 'fi tl1e under; surface ctthe bushing and this increesesf the resistaucete any tendency f6! Q theyere located whena piece iscleihped be twye' i'the jaws,v butalsoprevents-the parts] (111g; leo'se iuhder the influence of eedi N rl-"Work, it can be Teadilyslipped fe'rwardand ':;t'l eletivepqsitiohs'of the cam a'ndstud H 7 us site; r-a V--.thefire17tical Walls of theslot ihcreas'e' 1 the .studito sli beckward. This not only 7 'es'thait,the;axisjefxtheicam andeeccena f tri'fcj WIilldVWeys remain theplecelin Wlnch e A ji c identitefthe aptic i 'bf kttcol, 'OPe etinguPOhthe work, of 01? the aetieil of Y anyn mhihep 11 which the vise 'isinount 'btWithsta-ndiug:thefact thatthe' stu d' cannot slip backward s61as to loosen the 'i'eiiiutlocselied when it is desired to" change whackofthe fixed jaw fer the urpose? 7 jof proi idi'rig 'for' the clamping ofpieces eff A wise comprising base; aj jaQw fii ied P 0h metasegeslidenc'va'ble ztkmg the base, mjaw' mounted on the slide, said slide having1 a; longitudinally extending; uun'derecut slot than-inclinestowardi-thenjaw mounted on the slide, a stud cxtendiugrupwardly from the slotzind having its head located in said inclined slot, means for fasteningthe stud {L\j2tW,1IlOL1I1t8(l.O I1 "t11 e slide,;said 'slidehaving lalongitudMelly-extending,T shaped slot that-inclines toward th'ejawmounted on the slide, .stud extending upwardly from the slide and having a," T-shaped head located in aid inclined jslot', it bushingmounted on th fstud, "nut turning on the stud for clampiugthe bushing tothe slide, 'en ec'centricifim'ounted on thebushing, and a cam mounted,onjthe eccentric, "said cam being adapted te engegewith the back of thefixed if ALBERT e. 'HAGSTROM.

"on the base, a slide, n10vab1e alongthe base.-

